[latexr]

> Simon Sinek has never actually led anything and is basically someone who is an expert at marketing himself.

Taking him at his word on several of his talks, he leads a team right now. Presumably one focused on advancing your second point: his marketing of himself.

> His advice doesn’t say anything new and is usually extremely banal.

The corollary being they’re banal to you, cue tangential XKCD: https://www.xkcd.com/1053/

Note I’m not necessarily disagreeing with you. He also seems to me like someone who teaches what he learned by theory, not practice. However, I do believe his intentions are genuine, that he wants to make the workplace better for everyone, and that his points are actionable and positive. Contrast that to someone like Tony Robbins, which I view as little more than a scammer that wants to trick you into thinking anyone can be successful at anything if they just believe in themselves and pay him hefty sums to attend his seminars.